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f2fs: avoid race in between GC and block exchange 

During block exchange in {insert,collapse,move}_range, page-block mapping
is unstable due to mapping moving or recovery, so there should be no
concurrent cache read operation rely on such mapping, nor cache write
operation to mess up block exchange.

So this patch let background GC be aware of that.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2017-11-03 10:21:05 +08:00 committed by Jaegeuk Kim
parent f6986ede80
commit bb06664a53
2 changed files with 28 additions and 5 deletions
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26
fs/f2fs/file.c
View File

@ -1189,11 +1189,14 @@ static int f2fs_collapse_range(struct inode *inode, loff_t offset, loff_t len)
if (ret)
goto out;
/* avoid gc operation during block exchange */
down_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
truncate_pagecache(inode, offset);
ret = f2fs_do_collapse(inode, pg_start, pg_end);
if (ret)
goto out;
goto out_unlock;
/* write out all moved pages, if possible */
filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
@ -1205,7 +1208,8 @@ static int f2fs_collapse_range(struct inode *inode, loff_t offset, loff_t len)
ret = truncate_blocks(inode, new_size, true);
if (!ret)
f2fs_i_size_write(inode, new_size);
out_unlock:
up_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
out:
up_write(&F2FS_I(inode)->i_mmap_sem);
return ret;
@ -1388,6 +1392,9 @@ static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len)
if (ret)
goto out;
/* avoid gc operation during block exchange */
down_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
truncate_pagecache(inode, offset);
pg_start = offset >> PAGE_SHIFT;
@ -1415,6 +1422,8 @@ static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len)
if (!ret)
f2fs_i_size_write(inode, new_size);
up_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
out:
up_write(&F2FS_I(inode)->i_mmap_sem);
return ret;
@ -2277,9 +2286,13 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
}
inode_lock(src);
down_write(&F2FS_I(src)->dio_rwsem[WRITE]);
if (src != dst) {
if (!inode_trylock(dst)) {
ret = -EBUSY;
ret = -EBUSY;
if (!inode_trylock(dst))
goto out;
if (!down_write_trylock(&F2FS_I(dst)->dio_rwsem[WRITE])) {
inode_unlock(dst);
goto out;
}
}
@ -2339,9 +2352,12 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
}
f2fs_unlock_op(sbi);
out_unlock:
if (src != dst)
if (src != dst) {
up_write(&F2FS_I(dst)->dio_rwsem[WRITE]);
inode_unlock(dst);
}
out:
up_write(&F2FS_I(src)->dio_rwsem[WRITE]);
inode_unlock(src);
return ret;
}

7
fs/f2fs/gc.c
View File

@ -832,10 +832,17 @@ static void gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
continue;
}
if (!down_write_trylock(
&F2FS_I(inode)->dio_rwsem[WRITE])) {
iput(inode);
continue;
}
start_bidx = start_bidx_of_node(nofs, inode);
data_page = get_read_data_page(inode,
start_bidx + ofs_in_node, REQ_RAHEAD,
true);
up_write(&F2FS_I(inode)->dio_rwsem[WRITE]);
if (IS_ERR(data_page)) {
iput(inode);
continue;